1fanwang opened a new issue, #10671:
URL: https://github.com/apache/arrow-rs/issues/10671
**Describe the bug**
`substring()` rejects the view types:
```
substring(Utf8View ) ERR: Compute error: substring does not support type
Utf8View
substring(BinaryView) ERR: Compute error: substring does not support type
BinaryView
substring(Dict<Utf8View>) ERR: Compute error: substring does not support
type Utf8View
```
It takes `Utf8`, `LargeUtf8`, `Binary`, `LargeBinary`, `FixedSizeBinary` and
`Dictionary`, so a caller holding `StringViewArray` has to cast to `Utf8`
first, which copies the data.
The other string kernels in the same crate already take views: `length`,
`bit_length`, `like` and `concat_elements` all have `DataType::Utf8View` arms.
`substring.rs` is the only file in `arrow-string/src` that handles `Utf8` and
never mentions `Utf8View`.
**To Reproduce**
```rust
use arrow_array::StringViewArray;
use arrow_string::substring::substring;
let array = StringViewArray::from(vec![Some("hello world")]);
let err = substring(&array, 0, Some(5)).unwrap_err();
assert_eq!(err.to_string(), "Compute error: substring does not support type
Utf8View");
```
**Expected behavior**
`substring` accepts `Utf8View` and `BinaryView` and returns the same values
the `Utf8` and `Binary` paths return for the same input, including for a
dictionary whose values are a view array.
**Additional context**
Not listed under #6163.
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